[ Just adding Andrew to the cc list ] On Fri, 17 Jan 2014 18:24:28 +0800 Fengguang Wu <[email protected]> wrote: > > Hi Davidlohr, > > We noticed LTP test failures > > ltp.msgget02.1.TFAIL > ltp.semget02.2.TFAIL > ltp.semget02.3.TFAIL > > and the first bad commit is > > commit 5769cf6355d87f63906b3e51887eff7017c39217 > Author: Davidlohr Bueso <[email protected]> > AuthorDate: Wed Jan 15 16:56:01 2014 +1100 > Commit: Stephen Rothwell <[email protected]> > CommitDate: Wed Jan 15 16:56:01 2014 +1100 > > ipc: share ids rwsem when possible in ipcget_public > > ... and rewrite the function. For scenarios where the key is found and > we end up just doing different routinary checks, we can downgrade the > ids->rwsem and share it among concurrent readers. These checks include > the following, which are all safe to share the lock: > > ops->more_checks() >> sem_more_checks(), shm_more_checks() > ipc_check_perms() >> ipcperms(),ops->associate() >> > [lsm]_[ipctype]_associate() > > Signed-off-by: Davidlohr Bueso <[email protected]> > Cc: Aswin Chandramouleeswaran <[email protected]> > Cc: Rik van Riel <[email protected]> > Cc: Manfred Spraul <[email protected]> > Signed-off-by: Andrew Morton <[email protected]> > > ipc/util.c | 60 +++++++++++++++++++++++++++++++++--------------------------- > 1 file changed, 33 insertions(+), 27 deletions(-) > > Thanks, > Fengguang >
-- Cheers, Stephen Rothwell [email protected]
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